Left/Upper lamp blinks 2 times — Indoor temperature sensor fault

What does Left/Upper lamp 2-time blink mean?

This indicates a problem with the room temperature thermistor or the indoor coil thermistor. The unit may not operate normally.

• Room temperature thermistor fault
• Indoor coil thermistor fault
• Sensor circuit issue

Click steps to track your progress.

1. 1

   Check the room temperature thermistor and indoor coil thermistor.

2. 2

   Refer to section 10-7, 'Test point diagram and voltage', for diagnostic guidance.

3. 3

   Inspect the wiring and connections to the thermistors.